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Finding the Fourth Proportional to 439.70, 606.82 and 243.25

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Solution

The fourth proportional to 439.70, 606.82 and 243.25 is: 335.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.70 : 606.82 = 243.25 : x
  2. Step 2: Convert to fraction form
    439.70/606.82 = 243.25/x
  3. Step 3: Cross multiply
    439.70x = 606.82 × 243.25
  4. Step 4: Simplify right side
    439.70x = 147,608.97
  5. Step 5: Solve for x
    x = 147,608.97/439.70
  6. Step 6: Final answer
    x = 335.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.